Slides in this set

Slide 1

Slide 2

The transfer of energy by heating processes and the factors thataffect the rate at which the energy is transferredP1.1…read more

Slide 3

P1.1.1: Infrared Radiation All objects emit and absorb infrared radiation. The hotter an object is, the more infrared radiation it radiates in a given time. Dark, matt surfaces are good absorbers and good emitters of infrared radiation. Light, shiny surfaces are poor absorbers and poor emitters of infrared radiation. Light, shiny surfaces are good reflectors of infrared radiation.…read more

Slide 4

P1.1.2: Kinetic Theory The use of kinetic theory explains the different types of matter. The particles of solids, liquids and gases have different amounts of energy. Additional guidance: Candidates should be able to recognise simple diagrams to model the difference between solids, liquids and gases. An understanding of specific latent heat is not required.…read more

Slide 5

P1.1.3: Energy transfer by heating The transfer of energy by conduction, convection, evaporation and condensation involves particles. There are factors which affect the rate of evaporation and condensation. The rate at which an object transfers energy by heating depends on: Surface area and volume The material from which the object is made The nature of the surface with which the object is in contact The bigger the temperature difference between an object and its surroundings, the faster the rate at which energy is transferred by heating.…read more

Slide 6

P1.1.3: Energy transfer by heating Additional guidance: Candidates should understand in simple terms how the arrangement and movement of particles determine whether a material is a conductor or an insulator. Candidates should understand the role of free electrons in conduction through a metal. Candidates should be able to use the idea of particles moving apart to make a fluid less dense, to explain simple applications of convection. Candidates should be able to explain evaporation and the cooling effect this causes using kinetic theory. Candidates should be able to explain the design of devices in terms of energy transfer, for example, cooling fins. Candidates should be able to explain animal adaptations in terms of energy transfer, for example, relative ear size of animals in warm and cold climates.…read more